It's a little bit old but it's teh only one plugin to do this work: open in a new window the rss link!
Thanks for the plugin!
Update -- 20Oct2015 -- Still works on WordPress 4.3.1. But the developer's links to her site aren't connecting to her database so there is no way to contact her. I'd like to delete the line about "Powered by RSS Just Better 1.3 because it links to a nonfunctioning site.
I have a variety of RSS feeds and this one helps display some that other RSS feed displays can't handle really well.
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